Stacked Pixel Electrodes for Ultra-High Resolution Displays
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Solution Overview
Problem
The challenge in creating ultra-high resolution display devices is the difficulty in spacing pixel electrodes close enough due to the resolution limit of exposure processes, which restricts the miniaturization of pixel electrode size and distance between them.
Innovation Solution
The solution involves designing a display device with pixel electrodes spaced less than the width of a data line, where at least a portion of each electrode overlaps the data line, and using a method to form these electrodes on the same layer but with different materials and etching ratios, allowing for distances as small as 0.3 μm to 1.0 μm between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel electrodes are spaced closer to increase resolution, then display resolution is improved, but manufacturing precision deteriorates due to exposure resolution limits
Solution Approach 1:
The patent transitions from planar patterning to three-dimensional stacking, where pixel electrodes are arranged in multiple layers (first pixel electrode in first pixel area, second pixel electrode in second pixel area on different layer) rather than solely in the same plane. This vertical dimensionality change allows horizontal spacing to be reduced below exposure resolution limits while maintaining manufacturability through sequential layer formation.
Solution Approach 2:
The patent divides the pixel electrode structure into multiple discrete layers with insulating material between them. The first pixel electrode and second pixel electrode are formed as separate entities on different layers, allowing independent patterning and positioning. This segmentation enables each layer to be manufactured within existing precision capabilities while achieving overall sub-resolution spacing through cumulative layer stacking.
2Measurement precision
If pixel electrode size is reduced to increase resolution, then display resolution is improved, but device complexity increases
Solution Approach 1:
Instead of reducing pixel electrode size in the horizontal plane, the patent increases resolution by adding vertical layers. Each pixel electrode maintains sufficient size for straightforward manufacturing, while the multi-layer arrangement effectively increases pixel density. This dimensional transition preserves electrode simplicity while achieving high resolution through vertical stacking rather than horizontal miniaturization.
3Measurement precision
If pixel electrodes are spaced less than data line width, then display resolution is improved, but reliability deteriorates due to potential electrical interference
Solution Approach 1:
The patent positions pixel electrodes in different vertical layers rather than adjacent horizontal positions. The first pixel electrode resides in a first layer while the second pixel electrode is formed in a second layer separated by insulating material. This vertical separation in the z-dimension provides robust electrical insulation while enabling horizontal spacing to be reduced below data line width, simultaneously achieving high resolution and maintaining electrical reliability.
Solution Approach 2:
The patent introduces insulating material as an intermediary layer between the first pixel electrode and second pixel electrode. This insulating layer acts as a mediator that prevents direct electrical contact between adjacent pixel electrodes while allowing them to be positioned in close horizontal proximity. The intermediary insulating structure enables sub-data-line spacing without compromising electrical isolation or signal integrity.
Data Source
AI summary
A display device includes: a first substrate and a second substrate including a plurality of pixel areas and opposing each other; a liquid crystal layer between the first substrate and the second substrate; a first pixel electrode on the first substrate; a first insulating layer on the first pixel electrode; and a second pixel electrode on the first insulating layer and in a different pixel area from a pixel area in which the first pixel electrode is disposed.